Last updated: October 2026
How to prorate rent
Short answer: find the daily rent (monthly rent ÷ days in the month), count the days the tenant occupies the unit, and multiply. A move-in on the 10th of a 30-day month at $1,500 rent costs $1,050.
- Find the daily rate. Monthly rent ÷ number of days in that month. $1,500 ÷ 30 = $50/day.
- Count the occupied days. Move-in: last day of month − move-in day + 1 (the move-in day counts). Move-out: the move-out day itself (days 1 through that day).
- Multiply. Daily rate × occupied days = prorated rent.
- Round to cents. Always round the final amount to the nearest cent — never round the daily rate first, or the total drifts.
The prorated rent formula
Short answer: prorated rent = (monthly rent ÷ days in month) × days occupied. Move-in days = month length − move-in day + 1; move-out days = move-out day.
Prorated rent = (Monthly rent ÷ Days in month) × Days occupied
Move-in: days occupied = (last day of month) − (move-in day) + 1
Move-out: days occupied = move-out day
This is the standard pro-rata calculation applied to rent. Some leases use a flat 30-day divisor instead of the real calendar — the calculator supports both.
Prorated rent calculator for move-in
Short answer: in move-in mode you pay from your move-in day through the last day of the month. Moving in on the 15th of a 30-day month at $1,500 rent = $50/day × 16 days = $800.
Move-in is the most common reason to prorate rent. The key detail: your move-in day counts as an occupied day — moving in on the 10th of a 30-day month means 21 occupied days, not 20. The calculator's Move-in mode (the default above) handles this automatically, including February's 28 or 29 days when you set the year.
Prorated rent calculator for move-out
Short answer: in move-out mode you pay from the 1st through your move-out day. Moving out on the 5th of a 30-day month at $2,000 rent = $66.67/day × 5 days = $333.33.
Moving out early works the same math in reverse: you owe rent for each day up to and including your move-out day. Switch the calculator above to Move-out mode — it counts days 1 through your move-out day and shows the exact amount. Keep your security deposit separate: proration covers rent only, and most states require the deposit accounting to be itemized on its own.
Actual days vs 30-day month
Short answer: actual days in the month (28/29/30/31) is the fairest and most common method; the 30-day standard simplifies bookkeeping and appears in many corporate leases. Use whatever your lease specifies.
Notice February: actual-days gives a higher daily rate ($53.57) than the 30-day standard ($50.00). If your lease doesn't name a method, actual days is the safer default — it always matches the real calendar. If you're splitting move-in costs with roommates, run each person's share through the same method so nobody overpays.
Worked examples
Short answer: most partial months land between 30% and 70% of full rent. A mid-month move-in at $1,500 is $800; an early move-out at $2,000 is $333.33.
Sanity check: your prorated amount should always be less than a full month's rent and roughly proportional to the days occupied. Planning the bigger money picture? Our time value of money calculator shows what consistent rent savings grow into over time.
Frequently asked questions
What is prorated rent?
Prorated rent is the portion of a month's rent charged when a tenant occupies a rental for only part of the month — for example, moving in on the 10th or moving out on the 20th. Instead of the full rent, you pay the daily rate multiplied by the days you actually occupy the unit.
What is my prorated rent?
Use the calculator above: enter your monthly rent, your move-in or move-out date, and pick a method (actual days in the month or the 30-day standard). It shows your exact prorated rent plus the daily rate and the full math.
How much is prorated rent for a partial month?
Divide monthly rent by the days in the month, then multiply by days occupied. Example: $1,500 rent in a 30-day month, moving in on the 10th → daily rate $50 × 21 days = $1,050. Most partial months land between 30% and 70% of full rent.
Is there a “prorate rent calculator”?
Yes — “prorate rent calculator” is just a common misspelling of “prorated rent calculator,” and this page is exactly that tool. Enter your rent and date to get the prorated amount instantly.
What is a prorated calculator?
A prorated calculator is a tool that adjusts a full-period price down to a partial period. For rent, it converts your monthly rent into a fair partial-month amount based on the days you occupy the unit — which is what the calculator on this page does.
What does “prorated calculator rent” mean?
It's the same thing as a prorated rent calculator with the words in a different order — a tool that works out the partial-month rent you owe when you move in or out mid-month.
Is there a move out prorated rent calculator?
Yes — switch the calculator above to Move-out mode. Enter your monthly rent and your move-out day, and it works out what you owe from the 1st through that day. For example, $2,000 rent with a move-out on the 5th of a 30-day month = $333.33.
Do landlords have to prorate rent?
Most US states require landlords to prorate rent when a tenant moves in mid-month, and it's standard practice everywhere else — charging a full month for a partial stay is hard to defend. Check your lease and local tenant law; the calculation method (actual days vs 30-day) should be documented in the lease.
Should I use actual days or a 30-day month?
Actual days in the month is the most common and fairest method — it uses the real calendar (28, 29, 30 or 31 days). The 30-day standard simplifies bookkeeping and is common in corporate leases. Use whichever your lease specifies; if it doesn't say, actual days is the safer default.
Is my data private?
Completely. Every calculation runs locally in your browser with JavaScript — your rent and dates are never sent to a server, stored, or tracked.
